I personally can't guarantee that I can, but I can try to find the earliest post that I can find. Livio, however, can probably find your first post. But then it might turn out that you didn't want to find your first post, because it's terribly embarrassing.
Things I came across while searching for your first post:
Notable Caves of 2008 - Don't remember what the original poll was, but I still think that everyone was way too harsh to you.
This somewhat humorous chatbox conversation:
Saturday, 8:37pm - ThedeglitcherXD :Cattatron10:
Saturday, 8:38pm - ThedeglitcherXD Silver, are you that....
Saturday, 8:38pm - Silver YOU SPOKE IT! YOU SAID THE CURSED WORD! Should anyone say THAT word they will have bad luck for the rest of their day.
Saturday, 8:39pm - Silver Cattatr** is the cursed word. I left off two letters (on) so I won't be affected by the dreaded curse.
Saturday, 8:40pm - ThedeglitcherXD cattatron cattatron cattatron cattatron cattatron oh yeah
Saturday, 8:40pm - Silver Chatbox doesn't count, doofus
Saturday, 8:41pm - Yaya Then why did you leave off the 2 letters to not get cursed?
Saturday, 8:42pm - Silver Because then I would get cursed, you oblivious Jiffle!
Also, this was pretty amusing:
Reported PM's conversation in the chatbox:
[By clicking the "report this message" in your pm's, it sends the message you were sent to the interguild staff, where they then process it, by writing a message explaining what's going on, and then warning either the author, or the accuser(for false reporting), or they can just ignore and delete the report all together. A while back, I noticed that if you refreshed on the page after you warn the author or accuser, it will send out another warning to them. So, by F5 + enter(some confirmation message pops up), I am able to spam anyones inbox, with a lot of interguild warning pm's(which don't actually do anything)]
Original warning message was apparently "YOU IS BAD PERSONS"
[Captain Oblivious reports a PM from livio, and Quirvy seizes the opportunity to spam Livio's inbox]
Saturday, 7:31pm - Livio: whoa quirvy!
Saturday, 7:32pm - Livio: drowning me in PMs! You're gonna prune my inbox, but I guess I don't have anything important there.
Saturday, 7:35pm - Quirvy: Well, it tells me that my action has been successfully executed, so I'm hoping that if I keep on refreshing the page, it will say that it was pardoned or something
Saturday, 7:37pm - Quirvy: Actually, I think that I will use this power for good
Saturday, 7:38pm - Quirvy: Livio, do you think shos has any important PM's in his inbox?
Saturday, 7:42pm - Livio: whoa, 116 new PM's? I thought after a 100 things got pruned. Unless the database doesn't make that distinction when reading unread posts.(Haily made it so that no pm's ever get deleted)
Saturday, 7:42pm - Livio: no wait! don't attack shos' inbox! We might never finish the cave!
Saturday, 7:44pm - Livio: oh wait, the pruning function is run whenever a regular PM is sent, but the report page doesn't do that
Saturday, 7:46pm - Quirvy: So I can spam him as much as I want, and it won't prune anything?
Saturday, 7:46pm - Livio: oh no! now jazz is killing my inbox
Saturday, 7:46pm - Livio: That's it, I'm retaliating
Saturday, 7:46pm - Livio: @Quirvy: no pruning if the report page is sending those PM's
Saturday, 7:47pm - Quirvy: LIVIO! I DECLARE PEACE!!
Saturday, 7:47pm - Quirvy: I have matured and am moving on
Saturday, 7:48pm - Quirvy: ...moving on to shos, that is
Saturday, 7:49pm - Quirvy: Oh, wait, you were talking to jazz
Saturday, 7:51pm - Livio: uh oh, I just affected 2652 rows in the PM database table and it does not appear to have the desired effect
Saturday, 7:52pm - Quirvy: Livio!!
Saturday, 7:55pm - Livio: now my PM inbox is empty, but I have retaliated
Saturday, 7:55pm - Livio: Quirvy I redirected that last attack at Jazz
Saturday, 7:56pm - Quirvy: no you didn't. I have 126 new pm's
Saturday, 7:56pm - Quirvy: and they're all from myself
Saturday, 7:56pm - Jazz: Was anything supposed to happen?
Saturday, 7:57pm - Quirvy: Livio, you just epic failed
Saturday, 7:57pm - Livio: lol well I definitely don't have those PM's
Saturday, 7:57pm - Quirvy: are you getting any new ones?
Saturday, 8:01pm - Jazz: Don't direct any of mine to Catta.
Saturday, 8:02pm - Livio: I just sent them to quirvy this time, since a lot had built up
Saturday, 8:02pm - Livio: sounds like a plan
Saturday, 8:06pm - Quirvy: Livio, when I return, all 259 of these new Pm's had better be gone, and redirected to shos
Saturday, 8:06pm - Quirvy: or at least just not in my inbox anymore
Saturday, 8:07pm - Livio: oh that reminds me, i have to save shos' inbox
Saturday, 8:08pm - Livio: don't worry quirvy, I moved your PMs to someone else
Saturday, 8:09pm - Silver:
LIVIO!!!!!!!
Saturday, 8:10pm - Livio: What? those PM's are clearly from Quirvy
Saturday, 8:10pm - Silver: I hate you.
Saturday, 8:10pm - Livio: He's convinced that "you is bad persons"
Also, from my inbox(the warning message was originally directed towards shos):
'Quirvy' said:
You have received a warning from the Interguild Staff for the following reason:
I CAN HAZ SPAM INBOX?!!?
If you feel you were falsely accused, or the reason above was not understood, please reply to this message.
'Silver' said:
I never said that. My anti-clone said that. He accused me of it because... well, he just does that. I have been falsely and unfairly accused!